Troubleshooting
2. Remove the compressor’s cover.
3. Remove the terminal box cover from the top of the compressor motor to expose the three
terminals M, S, and C. See Figure 8. Disconnect wires 7, 8, and 9 from terminals C, M,
and S respectively.
4. With an ohmmeter, check the resistance across compressor terminals C and M. Resistance
should be 0.8 to 1.2 ohms. If the resistance is outside this range, consult a SCAI Service
Center. If there is no continuity, the winding is open. Consult a SCAI Service Center.
5. With an ohmmeter, check the resistance across compressor terminals C and S. Resistance
should be 1.8 to 2.2 ohms. If the resistance is outside this range, consult a SCAI Service
Center. If there is no continuity, the winding is open. Consult a SCAI Service Center.
6. With an ohmmeter, check for continuity between compressor terminal C and one of the
copper tubes entering the compressor housing. If there is continuity, the motor is grounded.
Consult a SCAI Service Center.
7. If the motor passes these electrical checks, reconnect wires 7, 8, and 9 to compressor
terminals C, M, and S respectively.
8. Replace the terminal box cover and the cover of the compressor module, unless current
measurement is to be performed.
Figure 8 Compressor Terminals
Current Measurement
Tools required: #2 Phillips screwdriver
Clamp-on ammeter
1. Disconnect the power to the compressor
SC
M
Temperature
Overload Switch
Compressor Motor
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